It would be like Sim City except you don't need a permenant online connection

Best description of omnipotence EVER

If I were god, I'd eliminate myopia/hyperopia/astigmatism so that no-one would be forced to wear glasses if they didn't want to, i.e. as a fashion choice, or at least make laser eye treatment completely non-invasive and 100% successful.

I'd also force a Western localisation and release of Miles Edgeworth: Ace Attorney Investigations 2 and Professor Layton vs Ace Attorney. Because WE NEED THESE GAMES.

Yup, they're the two most pressing issues, obviously

Oh, I'd also travel to parallel universes and see how my life could have gone differently thus far.